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Air-water carbon dioxide fluxes in a Mediterranean wetland

AuthorsMorris, Edward P. ; Flecha, Susana ; Figuerola, Jordi ; Costas, Eduardo; Rodríguez-Ros, P. ; Ruiz Segura, Javier ; Navarro, Gabriel ; Huertas, I. Emma
Keywordscarbon dioxide
air-water flux
ecosystem services
carbon sequestration
Donana Natural Area
Issue Date21-Dec-2012
AbstractInland and transitional aquatic systems are hotspots for biogeochemical transformations and play an important, previously under appreciated, role in global carbon (C) cycling. Of these diverse habitat types, wetlands and floodplains cover a global area about 3 times that of lakes, rivers and streams, yet are poorly constrained in terms of in-situ data. Understanding the potential role of wetlands in C cycling is particularly important considering their global losses and the increasingly apparent effects of climate change. Here we examine air-water CO2 fluxes in the Mediterranean wetlands of Donaña National Park, SW Spain. Total alkalinity and pH (as well as a number of other physiochemical variables) of a representative range of permanent and temporal water bodies were examined monthly during 2010-11. Dissolved pCO2 was calculated and vertical air-water CO2 fluxes were derived. Spatio-temporal variations in fluxes were examined in reference to changing physiochemical parameters, providing insights into their control. Remote sensing of water coverage was combined with the measured fluxes to give an ecosystem estimate of the contribution of aquatic habitats to CO2 transport. Clear spatial differences in areal CO2 fluxes were found; semi-permanent ponds adjacent to the large Guadalquivir estuary acted as mild sinks for CO2, whilst the temporal wetlands of Donaña were strong sources of CO2. Other semi-permanent streams and lakes within the park changed seasonally, acting as strong sources in spring—winter and mild sinks in summer-autumn. Overall, because efflux events were much stronger than influxes, nearly all water bodies were net annual sources of CO2. Upscaling areal fluxes considering the surface area of water in the region clarified the overwhelming importance of seasonal flooding.
DescriptionPoster presentation (Nov. 2012) at the Global Change in the Mediterranean Symposium, Casa de Ciencias, Sevilla, Spain.
Appears in Collections:(ICMAN) Comunicaciones congresos
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